| After synthersizing a lot of relevant documents, consulting many experts and investigating a large amount of teen-agers, this study provides a system of evaluating standard index to select teen-ager athletes for football, badminton, wushu, which are the three important competitive sports in Vietnam. Following similar Chinese fieldwork models, we investigated an amount of 2035 Vietnamese athletes (aged 12 to 18) in 7 cities and provinces all over Vietnam.The investigation included 5 major items:body shape, body function, perfomance level of competance, professional skills and psychological abitity.For the first time in Vietnam, the thesis offers an evaluating standard index system, in which bone-age index is used as an important evaluating standard. This is a contribution to the scientific-oriented tendency of Vietnamese sport training and athlete selecting field.The conclusions are as follows:1. The characteristics of Vietnamese football, badminton and wushu teen-ager athletes' s bone-age are:(1) Among the investigated male athletes, early type accounts for 8,2%, normal type amounts to 83,8% and late type makes up 8%.Among the investigated female athletes, early type accounts for 5,7%, normal type amounts to 77,9%, late type makes up 16,4%(2) The above findings are generally similar to relevant Chinese research, the similarity reflects in all the three types of bone-age group, however these figures contradict the results of Vietnamese former research. In details, the figures of early type are obviously lower, the figures of normal type are significantly higher, and the figures of late group remain the same. These figures prove that the athlete/athletess selecting in Vietnam has made a big progress both in quantity and in quality.(3) In comparison among the three sports, the figures are gennerally similar in normal type and late type of the investigated athletes.However, the figure of early type in football item(12,8%) is obviously bigger than that of badminton item(6%) and wushu item(5,8%).As for the investigated athletesses, the percentage of the three type of bone-age are the same between badminton and wushuitem, but in football item, the figure of early type is zero, while the figure of late type is very high (28,1%).2. The body shape, body function, perfomnance level of competance of Vietnamese football, badminton and wushu teen-ager players have some following characteristics:(1) Adolescence's peak age of Vietnamese football, badminton and wushu teen-ager athletes is from age 13 to 15, that of athletesses is from 12 to 14.In this period, their body height quickly increase, body shape figures are higher than that of other Vietnamese pupils of the same age, but lower than that of Chinese players at the same age.(2) Comparing the body funtion item, the figure level of Vietnamese football players is lower than Chinese players, this can reflect by the figures of vital capacity and cardiac cycle number. The figures of vital capacity/body weight and cardiac cycle index number between Vietnamese teen-ager athletes and athletesses are gennerally equal, both are low and unstable. The figures of vital capacity/body weight and cardiac cycle index number of Vietnamese wushu athletes are much better than that of football and badminton athletes at the same age.(3) Applying Chinese evaluating standard index system to measure the perfomnance level of competance and the professional skill of Vietnamsese players at the same age, the results are as follows:1) As for the four items to evaluate the perfomnance level of competance, Vietnamese football athletes can only reach to "poor" or "rather poor" levl.As for the professional skill, they can only reach to "average" level.The situation of football athletesses is even worse.2) The perfomnance level of competance and the professional skill of Vietnamsese badminton players can only reach to "rather poor" level.3) As for the standing long jump item, the levels are equal among football, badmi...
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